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(N0 Modex.) 2 ShetsSheet 1 P.'PRYIBIL 85- E. D. MAUKINTOSH LATHE FOR TURNING POLYGONAL FORMS. No.- 305,712. Patented Sept. 23. 1884.

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LATHE FOR TURNING POLYGONAL FORMS.

No. 805,712. Patented Sept. 23, 1884.

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PAUL PRYIBIL, OF NEYV YORK, AND EDWVABD D. MAGKINTOSH, 'OF BROOK- LYN, N. Y.; SAID MAGKINTOSH ASSIGNOR TO SAID PRYIBIL.

LATHE FOR TURNING POLYGONAL FORMS.

SPECIFICATION forming part of Letters Patent No. 305,712, dated September 23, 1884-.

Application filed May 7, 1884. (No model.)

To all whom it mciy concern:

Be it known that we, PAUL PRYIBIL and EDWARD D. MAcKIN'rosn, citizens of the United States, and residents, respectively, of New York, in the county and State of New York, and of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Lathes for Turning Polygonal Forms, of which the following is a specification.

Our invention relates to improvements in that classof lathes in which several bars of wood or other suitable material are arranged in the approximate form of a cylinder, the outer surface of which is then acted upon by a cutting-tool; and the objects of our invention are, first, to facilitate the operation of placing the bars and securing them firmly in place; second, to provide means for holding different sizes in the same machine; and, third, to prevent the light from shining through the spaces between the bars into the operators eyes. \Ve attain these objects by novel com binations of parts hereinafter particularly de scribed, andpointed out in the claims.

In the accompanying drawings, Figure lis a vertical section of our lathe, the supportingbearings, &c., being shown in elevation; Fig. 2, an end elevation of the same removed from the shaft and partly broken away. Figs. 3 and 4 are enlarged sections of portions of the heads A and B with attachments in place. Figs. 5 and 6 are elevations of. the same; and Figs. '7 and 8 are enlarged end and side elevations, respectively, of a piece turned in our lathe.

The same letters refer to like parts throughout the several views.

Cis a shaft mounted in suitable bearings, and provided with tight and loose pulleys or other suitable means for revolving the same. Upon this shaft are mounted two heads, A and B, the former being fixed thereon by a set-screw or other suitable means, and the latter being prevented from turning independently of the shaft 0 by a feather, b, but capable of axial motion, limited in one direction by the loose collar 0, which can be secured by its set-screw in any suitable position on the normal condition, extend beyond the holes,

but are capable of being compressed wholly within the latter. Between these holes, and secured to the head Aby screws or other suitable means, are partition-pieces a, of such shape that they, in combination with the rim a of the head A, form sockets which fit the square bars, D, that are to be operated upon. The part of these partitionswhich is toward the shaft is recessed at a", to enable the bar D to be inclined, as shown by the dotted lines of Fig. 1, for purposes to be more fully hereinafter described. 1

In the head B, and directly opposite to the described sockets, are screw-centers Z), which can be adjusted to project to any suitable distance through the head B, and be secured in such position by their jam-nuts. tween these centers are pins bor spacing projections, the clear space between each pair of which is equal to the full thickness of the square bar to be operated upon, while the distance from the center line of centers b to outer face, B, of ring B" is equal to one-half such thickness. Thus the pins 2) and the ring B form supports, which hold one end of the bar D in position, and prevent it from moving except in the direction of the position shown by dotted lines in Fig. 1.

'15 is a removable reducing-piece fitted within the socket formed by the partition-pieces a and the rim c for'the purpose of reducing the size of socket to adapt it to abar of smaller section. v

F is a removable reducing-piece notched to fit the pins Z), and used for the same purpose as the piece E.

A and B are drums, preferably of sheet Midway bemetal, and secured to the heads A and B, rc-

spectively.

Such being the construction, the operation is as follows: The head B is placed upon the shaft 0 in such aposition that the distance beiso tween its face B and the face a of the rim a will be a little less than equal to the length of the-bar to be operated upon. The collarO is then placed against the head B, and fixed 5 firmly in such position by means of its setscrew, and the screw-centers b are set to project a short distance beyond the face B One end of one of the bars, D, to be operated upon is then placed in one of the sockets formed by the partitionpieces a and the rim (6 in the position shown by dotted lines in Fig. 1. It is then pressed down against the ring B and between two of the pins I), which accurately determine its position, where it is held on one end by the socket formed by the partitionpieces a and rim a, and on the other end by the screw-center 1), against which it is forced by the spring a with sufficient force to P].6-' vent it from falling outwhen the heads are turned around as the successive bars are placed in position. \Vhen all the sockets have been thus filled, the heads A and B are drawn forcibly together by the bolts G and their nuts, thereby clamping the bars D firmly between the faces of the heads, the springs to being compressed into the holes, and the screw-centers I) forced into the ends of the bars. The shaft 0 is then revolved in its bearings by any suitable means, carrying with it the heads A and B with all their attachments, and the outer faces, D, are acted on by any suitable tool for turning them to any desired shape, the whole length, with the exception of that covered by the rim (6, being accessible for the purpose. Vhen the turning of the exposed faces is completed, the nuts on the bolts G are turned back, the head B brought against the collar 0, and the bars D removed from their places and reinserted, so as to expose another 0 face.

After the screw-centers b have been once forced into the'bars D, as above described, the indentation thus produced serves thereafter to center the bars in replacing them, even though their sides be turned away so that they no longer touch the supports Pf or b.

By employing removable reducing-pieces E and F of proper sizes, any size of bar within certain limits can be turned in the one lathe.

The drums A and B are employed to prevent the light from shining through the spaces between the bars D into the operator s eyes.

Although we have shown and described a lathe fitted for square bars, it is obvious that .our invention may be adapted to bars of any polygonal section by constructing the sockets, &c., to fit.

Having now described our invention, what we claim as new, and desire to secure by Let ters Patent, is'' 1. In a lathe for turning polygonal forms, the devicev herein described for holding blanks, consisting of a rotary shaft, two heads mounted thereon capable of longitudinal moveblanks,consisting of a rotary shaft, two heads mounted thereon and capable of longitudinal movement relatively to each other, one head having on its inner face a circular series of sockets adapted to receive the ends of the blanks and to hold them against turning, and the other head being provided with a circular series of centers, 1), projecting beyond its inner face and arranged opposite to said sockets, and with spacing projections I) between said centers, and a circular series of bolts, G, extending between said heads for bringing them nearer together, all combined and organized for operation substantially as herein described;

3. In a lathe for turning polygonal forms,

the device herein described for temporarily sustaining and holding the blanks, consisting of a rotary shaft, two heads mounted thereon and capable of longitudinal movement relatively to each other, one head having on its inner face a circular series of sockets adapted to receive the ends of the blanks,and severally provided with recesses containing springs which project beyond the bottoms of the recesses, but are capable of compression thereinto,whereby the blanks are held against turning and have pressure exerted upon their ends by the said springs, and the other head being provided with a circular series of centers, 2), projecting beyond its inner face and arranged opposite the several sockets, all combined and organized for operation substantially as herein described.

l 4. In a lathe for turning polygonal forms, and consisting, essentially, of a shaft carrying twoheads, between which the blanks are held, and one of which is movable upon the shaft in the direction of its axis, the device for preventing the'light from shining through the spaces between the blanks, consisting of two drums fixed, respectively, to the two heads, and arranged to telescopeone within the other,

substantially as described,and for the purpose specified.

,5. In a lathe for turning polygonal forms, the device for holding the blanks, consisting, essentially, of two circular heads mounted on a shaft, one of which is movable thereon in the direction of its axis, the first being pro- 5 vided near its periphery with centers projecting beyond its face toward the second, and of such form as can be easily pressed into the blanks, and also with removablopoekvent them. from turning, substantially as deets fitting the ends of the blanks snfficiently scribed to prevent lateral motion thereof, except in PAUL PRYIBIL. the direction from the shaft, the inner side EDWARD DpMACKINTOSH. 5 of the second being provided with an equal Witnesses:

number of opposed removable sockets fitting l FRED L. MA KINTQSH,

the ends of the blanks sufficiently to pre- PAUL PRYIBIL, J1. 

